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[SystemZ] Fix fallout from r288374 

Avoid undefined behavior due to too-large shift count.

llvm-svn: 288391
This commit is contained in:
Ulrich Weigand 2016-12-01 18:00:50 +00:00
parent cf26d56390
commit d36b31d03f
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
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@ -101,7 +101,8 @@ void SystemZMCAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
// Big-endian insertion of Size bytes.
Value = extractBitsForFixup(Kind, Value);
Value &= ((uint64_t)1 << BitSize) - 1;
if (BitSize < 64)
Value &= ((uint64_t)1 << BitSize) - 1;
unsigned ShiftValue = (Size * 8) - 8;
for (unsigned I = 0; I != Size; ++I) {
Data[Offset + I] |= uint8_t(Value >> ShiftValue);